package com.zhang.hadoop.netty.netty.codec.codec1;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.protobuf.ProtobufEncoder;

/**
 * @author: zhang yufei
 * @create: 2022-01-16 15:25
 * @description:
 **/
public class NettyClient {

    public static void main(String[] args) {

        //客户端需要一个事件循环组
        EventLoopGroup eventExecutors = new NioEventLoopGroup();
        try {
            //创建客户端启动对象
            //注意客户端使用的不是ServerBootStrap而是BootStrap
            Bootstrap bootstrap = new Bootstrap();
            //设置相关参数
            bootstrap.group(eventExecutors)//设置线程组
                    .channel(NioSocketChannel.class)
                    .handler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        protected void initChannel(SocketChannel socketChannel) throws Exception {
                            //在pipeline中加入ProtoBufEncoder
                            socketChannel.pipeline().addLast("encoder", new ProtobufEncoder());
                            socketChannel.pipeline().addLast(new NettyClientHandler());
                        }
                    });
            System.out.println("客户端 ok");
            //启动客户端去连接服务器
            //关于channelFuture要分析，涉及到netty的异步模型
            ChannelFuture channelFuture = bootstrap.connect("127.0.0.1", 6668).sync();
            //给关闭通道进行监听
            channelFuture.channel().closeFuture().sync();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            eventExecutors.shutdownGracefully();
        }

    }

}
